#include <bits/stdc++.h>
using namespace std;

// #define ONLINE_JUDGE

#ifndef ONLINE_JUDGE
#define dbg(x...) { cerr << "\033[32;1m" << #x << " -> "; err(x); }
void err() { cerr << "\033[39;0m" << endl; }
template<typename T, typename... A>
void err(T a, A... x) { cerr << a << ' '; err(x...); }
#else
#define dbg(...)
#endif

typedef long long LL;

int main(int argc, char const *argv[])
{
	int t;
	scanf("%d", &t);
	for (int kk=0; kk<t; ++kk)
	{
		int a, b;
		scanf("%d%d", &a, &b);
		int cnt = 0;
		for (int x=9; x<=b; x=x*10+9)
			++cnt;
		printf("%lld\n", 1LL*a*cnt);
	}	
	return 0;
}